deb-manila/manila/quota.py
Valeriy Ponomaryov c0019bce6b Add snapshot gigabytes quota
Manila has used single gigabytes quota for shares and snapshots.
Config opt 'no_snapshot_gb_quota' is set to False by default, that has been
used for enabling/disabling of snapshot gigabytes quota considerations.

Add separate snapshot gigabyte quota and remove opt 'no_snapshot_gb_quota' that
is not needed anymore. To be able to set infinite quota for snapshot gigabytes,
just set value for new config option 'quota_snapshot_gigabytes' to '-1'.

Change-Id: I43cb95ff3d0d3e6191f520b52edb67a0a44e9c2c
Implements BP add-snapshot-gb-quota
2015-02-26 07:42:28 +00:00

1089 lines
46 KiB
Python

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Quotas for shares."""
import datetime
from oslo_config import cfg
from oslo_log import log
from oslo_utils import importutils
from oslo_utils import timeutils
import six
from manila import db
from manila import exception
from manila.i18n import _LE
LOG = log.getLogger(__name__)
quota_opts = [
cfg.IntOpt('quota_shares',
default=50,
help='Number of shares allowed per project.'),
cfg.IntOpt('quota_snapshots',
default=50,
help='Number of share snapshots allowed per project.'),
cfg.IntOpt('quota_gigabytes',
default=1000,
help='Number of share gigabytes allowed per project.'),
cfg.IntOpt('quota_snapshot_gigabytes',
default=1000,
help='Number of snapshot gigabytes allowed per project.'),
cfg.IntOpt('quota_share_networks',
default=10,
help='Number of share-networks allowed per project.'),
cfg.IntOpt('reservation_expire',
default=86400,
help='Number of seconds until a reservation expires.'),
cfg.IntOpt('until_refresh',
default=0,
help='Count of reservations until usage is refreshed.'),
cfg.IntOpt('max_age',
default=0,
help='Number of seconds between subsequent usage refreshes.'),
cfg.StrOpt('quota_driver',
default='manila.quota.DbQuotaDriver',
help='Default driver to use for quota checks.'), ]
CONF = cfg.CONF
CONF.register_opts(quota_opts)
class DbQuotaDriver(object):
"""Database Quota driver.
Driver to perform necessary checks to enforce quotas and obtain
quota information. The default driver utilizes the local
database.
"""
def get_by_project_and_user(self, context, project_id, user_id, resource):
"""Get a specific quota by project and user."""
return db.quota_get(context, project_id, user_id, resource)
def get_by_project(self, context, project_id, resource):
"""Get a specific quota by project."""
return db.quota_get(context, project_id, resource)
def get_by_class(self, context, quota_class, resource):
"""Get a specific quota by quota class."""
return db.quota_class_get(context, quota_class, resource)
def get_defaults(self, context, resources):
"""Given a list of resources, retrieve the default quotas.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
"""
quotas = {}
default_quotas = db.quota_class_get_default(context)
for resource in resources.values():
quotas[resource.name] = default_quotas.get(resource.name,
resource.default)
return quotas
def get_class_quotas(self, context, resources, quota_class,
defaults=True):
"""Retrieve quotas for a quota class.
Given a list of resources, retrieve the quotas for the given
quota class.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param quota_class: The name of the quota class to return
quotas for.
:param defaults: If True, the default value will be reported
if there is no specific value for the
resource.
"""
quotas = {}
class_quotas = db.quota_class_get_all_by_name(context, quota_class)
for resource in resources.values():
if defaults or resource.name in class_quotas:
quotas[resource.name] = class_quotas.get(resource.name,
resource.default)
return quotas
def _process_quotas(self, context, resources, project_id, quotas,
quota_class=None, defaults=True, usages=None,
remains=False):
modified_quotas = {}
# Get the quotas for the appropriate class. If the project ID
# matches the one in the context, we use the quota_class from
# the context, otherwise, we use the provided quota_class (if
# any)
if project_id == context.project_id:
quota_class = context.quota_class
if quota_class:
class_quotas = db.quota_class_get_all_by_name(context, quota_class)
else:
class_quotas = {}
default_quotas = self.get_defaults(context, resources)
for resource in resources.values():
# Omit default/quota class values
if not defaults and resource.name not in quotas:
continue
limit = quotas.get(
resource.name,
class_quotas.get(resource.name, default_quotas[resource.name]))
modified_quotas[resource.name] = dict(limit=limit)
# Include usages if desired. This is optional because one
# internal consumer of this interface wants to access the
# usages directly from inside a transaction.
if usages:
usage = usages.get(resource.name, {})
modified_quotas[resource.name].update(
in_use=usage.get('in_use', 0),
reserved=usage.get('reserved', 0),
)
# Initialize remains quotas.
if remains:
modified_quotas[resource.name].update(remains=limit)
if remains:
all_quotas = db.quota_get_all(context, project_id)
for quota in all_quotas:
if quota.resource in modified_quotas:
modified_quotas[quota.resource]['remains'] -= (
quota.hard_limit)
return modified_quotas
def get_project_quotas(self, context, resources, project_id,
quota_class=None, defaults=True,
usages=True, remains=False):
"""Retrieve quotas for project.
Given a list of resources, retrieve the quotas for the given
project.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param project_id: The ID of the project to return quotas for.
:param quota_class: If project_id != context.project_id, the
quota class cannot be determined. This
parameter allows it to be specified. It
will be ignored if project_id ==
context.project_id.
:param defaults: If True, the quota class value (or the
default value, if there is no value from the
quota class) will be reported if there is no
specific value for the resource.
:param usages: If True, the current in_use and reserved counts
will also be returned.
:param remains: If True, the current remains of the project will
will be returned.
"""
project_quotas = db.quota_get_all_by_project(context, project_id)
project_usages = None
if usages:
project_usages = db.quota_usage_get_all_by_project(context,
project_id)
return self._process_quotas(context, resources, project_id,
project_quotas, quota_class,
defaults=defaults, usages=project_usages,
remains=remains)
def get_user_quotas(self, context, resources, project_id, user_id,
quota_class=None, defaults=True,
usages=True):
"""Retrieve quotas for user and project.
Given a list of resources, retrieve the quotas for the given
user and project.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param project_id: The ID of the project to return quotas for.
:param user_id: The ID of the user to return quotas for.
:param quota_class: If project_id != context.project_id, the
quota class cannot be determined. This
parameter allows it to be specified. It
will be ignored if project_id ==
context.project_id.
:param defaults: If True, the quota class value (or the
default value, if there is no value from the
quota class) will be reported if there is no
specific value for the resource.
:param usages: If True, the current in_use and reserved counts
will also be returned.
"""
user_quotas = db.quota_get_all_by_project_and_user(context,
project_id, user_id)
# Use the project quota for default user quota.
proj_quotas = db.quota_get_all_by_project(context, project_id)
for key, value in six.iteritems(proj_quotas):
if key not in user_quotas.keys():
user_quotas[key] = value
user_usages = None
if usages:
user_usages = db.quota_usage_get_all_by_project_and_user(
context, project_id, user_id)
return self._process_quotas(context, resources, project_id,
user_quotas, quota_class,
defaults=defaults, usages=user_usages)
def get_settable_quotas(self, context, resources, project_id,
user_id=None):
"""Retrieve range of settable quotas.
Given a list of resources, retrieve the range of settable quotas for
the given user or project.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param project_id: The ID of the project to return quotas for.
:param user_id: The ID of the user to return quotas for.
"""
settable_quotas = {}
project_quotas = self.get_project_quotas(context, resources,
project_id, remains=True)
if user_id:
user_quotas = self.get_user_quotas(context, resources,
project_id, user_id)
setted_quotas = db.quota_get_all_by_project_and_user(
context, project_id, user_id)
for key, value in user_quotas.items():
maximum = (project_quotas[key]['remains'] +
setted_quotas.get(key, 0))
settable_quotas[key] = dict(
minimum=value['in_use'] + value['reserved'],
maximum=maximum)
else:
for key, value in project_quotas.items():
minimum = max(int(value['limit'] - value['remains']),
int(value['in_use'] + value['reserved']))
settable_quotas[key] = dict(minimum=minimum, maximum=-1)
return settable_quotas
def _get_quotas(self, context, resources, keys, has_sync, project_id=None,
user_id=None):
"""Retrieve quotas for a resource.
A helper method which retrieves the quotas for the specific
resources identified by keys, and which apply to the current
context.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param keys: A list of the desired quotas to retrieve.
:param has_sync: If True, indicates that the resource must
have a sync attribute; if False, indicates
that the resource must NOT have a sync
attribute.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
:param user_id: Specify the user_id if current context
is admin and admin wants to impact on
common user.
"""
# Filter resources
if has_sync:
sync_filt = lambda x: hasattr(x, 'sync')
else:
sync_filt = lambda x: not hasattr(x, 'sync')
desired = set(keys)
sub_resources = dict((k, v) for k, v in resources.items()
if k in desired and sync_filt(v))
# Make sure we accounted for all of them...
if len(keys) != len(sub_resources):
unknown = desired - set(sub_resources.keys())
raise exception.QuotaResourceUnknown(unknown=sorted(unknown))
if user_id:
# Grab and return the quotas (without usages)
quotas = self.get_user_quotas(context, sub_resources,
project_id, user_id,
context.quota_class, usages=False)
else:
# Grab and return the quotas (without usages)
quotas = self.get_project_quotas(context, sub_resources,
project_id,
context.quota_class,
usages=False)
return dict((k, v['limit']) for k, v in quotas.items())
def limit_check(self, context, resources, values, project_id=None,
user_id=None):
"""Check simple quota limits.
For limits--those quotas for which there is no usage
synchronization function--this method checks that a set of
proposed values are permitted by the limit restriction.
This method will raise a QuotaResourceUnknown exception if a
given resource is unknown or if it is not a simple limit
resource.
If any of the proposed values is over the defined quota, an
OverQuota exception will be raised with the sorted list of the
resources which are too high. Otherwise, the method returns
nothing.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param values: A dictionary of the values to check against the
quota.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
:param user_id: Specify the user_id if current context
is admin and admin wants to impact on
common user.
"""
# Ensure no value is less than zero
unders = [key for key, val in values.items() if val < 0]
if unders:
raise exception.InvalidQuotaValue(unders=sorted(unders))
# If project_id is None, then we use the project_id in context
if project_id is None:
project_id = context.project_id
# If user id is None, then we use the user_id in context
if user_id is None:
user_id = context.user_id
# Get the applicable quotas
quotas = self._get_quotas(context, resources, values.keys(),
has_sync=False, project_id=project_id)
user_quotas = self._get_quotas(context, resources, values.keys(),
has_sync=False, project_id=project_id,
user_id=user_id)
# Check the quotas and construct a list of the resources that
# would be put over limit by the desired values
overs = [key for key, val in values.items()
if (quotas[key] >= 0 and quotas[key] < val) or
(user_quotas[key] >= 0 and user_quotas[key] < val)]
if overs:
raise exception.OverQuota(overs=sorted(overs), quotas=quotas,
usages={})
def reserve(self, context, resources, deltas, expire=None,
project_id=None, user_id=None):
"""Check quotas and reserve resources.
For counting quotas--those quotas for which there is a usage
synchronization function--this method checks quotas against
current usage and the desired deltas.
This method will raise a QuotaResourceUnknown exception if a
given resource is unknown or if it does not have a usage
synchronization function.
If any of the proposed values is over the defined quota, an
OverQuota exception will be raised with the sorted list of the
resources which are too high. Otherwise, the method returns a
list of reservation UUIDs which were created.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param deltas: A dictionary of the proposed delta changes.
:param expire: An optional parameter specifying an expiration
time for the reservations. If it is a simple
number, it is interpreted as a number of
seconds and added to the current time; if it is
a datetime.timedelta object, it will also be
added to the current time. A datetime.datetime
object will be interpreted as the absolute
expiration time. If None is specified, the
default expiration time set by
--default-reservation-expire will be used (this
value will be treated as a number of seconds).
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
:param user_id: Specify the user_id if current context
is admin and admin wants to impact on
common user.
"""
# Set up the reservation expiration
if expire is None:
expire = CONF.reservation_expire
if isinstance(expire, (int, long)):
expire = datetime.timedelta(seconds=expire)
if isinstance(expire, datetime.timedelta):
expire = timeutils.utcnow() + expire
if not isinstance(expire, datetime.datetime):
raise exception.InvalidReservationExpiration(expire=expire)
# If project_id is None, then we use the project_id in context
if project_id is None:
project_id = context.project_id
# If user_id is None, then we use the project_id in context
if user_id is None:
user_id = context.user_id
# Get the applicable quotas.
# NOTE(Vek): We're not worried about races at this point.
# Yes, the admin may be in the process of reducing
# quotas, but that's a pretty rare thing.
quotas = self._get_quotas(context, resources, deltas.keys(),
has_sync=True, project_id=project_id)
user_quotas = self._get_quotas(context, resources, deltas.keys(),
has_sync=True, project_id=project_id,
user_id=user_id)
# NOTE(Vek): Most of the work here has to be done in the DB
# API, because we have to do it in a transaction,
# which means access to the session. Since the
# session isn't available outside the DBAPI, we
# have to do the work there.
return db.quota_reserve(context, resources, quotas, user_quotas,
deltas, expire,
CONF.until_refresh, CONF.max_age,
project_id=project_id, user_id=user_id)
def commit(self, context, reservations, project_id=None, user_id=None):
"""Commit reservations.
:param context: The request context, for access checks.
:param reservations: A list of the reservation UUIDs, as
returned by the reserve() method.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
:param user_id: Specify the user_id if current context
is admin and admin wants to impact on
common user.
"""
# If project_id is None, then we use the project_id in context
if project_id is None:
project_id = context.project_id
# If user_id is None, then we use the user_id in context
if user_id is None:
user_id = context.user_id
db.reservation_commit(context, reservations, project_id=project_id,
user_id=user_id)
def rollback(self, context, reservations, project_id=None, user_id=None):
"""Roll back reservations.
:param context: The request context, for access checks.
:param reservations: A list of the reservation UUIDs, as
returned by the reserve() method.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
:param user_id: Specify the user_id if current context
is admin and admin wants to impact on
common user.
"""
# If project_id is None, then we use the project_id in context
if project_id is None:
project_id = context.project_id
# If user_id is None, then we use the user_id in context
if user_id is None:
user_id = context.user_id
db.reservation_rollback(context, reservations, project_id=project_id,
user_id=user_id)
def usage_reset(self, context, resources):
"""Reset usage records.
Reset the usage records for a particular user on a list of
resources. This will force that user's usage records to be
refreshed the next time a reservation is made.
Note: this does not affect the currently outstanding
reservations the user has; those reservations must be
committed or rolled back (or expired).
:param context: The request context, for access checks.
:param resources: A list of the resource names for which the
usage must be reset.
"""
# We need an elevated context for the calls to
# quota_usage_update()
elevated = context.elevated()
for resource in resources:
try:
# Reset the usage to -1, which will force it to be
# refreshed
db.quota_usage_update(elevated, context.project_id,
context.user_id,
resource, in_use=-1)
except exception.QuotaUsageNotFound:
# That means it'll be refreshed anyway
pass
def destroy_all_by_project(self, context, project_id):
"""Destroy metadata associated with a project.
Destroy all quotas, usages, and reservations associated with a
project.
:param context: The request context, for access checks.
:param project_id: The ID of the project being deleted.
"""
db.quota_destroy_all_by_project(context, project_id)
def destroy_all_by_project_and_user(self, context, project_id, user_id):
"""Destroy metadata associated with a project and user.
Destroy all quotas, usages, and reservations associated with a
project and user.
:param context: The request context, for access checks.
:param project_id: The ID of the project being deleted.
:param user_id: The ID of the user being deleted.
"""
db.quota_destroy_all_by_project_and_user(context, project_id, user_id)
def expire(self, context):
"""Expire reservations.
Explores all currently existing reservations and rolls back
any that have expired.
:param context: The request context, for access checks.
"""
db.reservation_expire(context)
class BaseResource(object):
"""Describe a single resource for quota checking."""
def __init__(self, name, flag=None):
"""Initializes a Resource.
:param name: The name of the resource, i.e., "shares".
:param flag: The name of the flag or configuration option
which specifies the default value of the quota
for this resource.
"""
self.name = name
self.flag = flag
def quota(self, driver, context, **kwargs):
"""Obtain quota for a resource.
Given a driver and context, obtain the quota for this
resource.
:param driver: A quota driver.
:param context: The request context.
:param project_id: The project to obtain the quota value for.
If not provided, it is taken from the
context. If it is given as None, no
project-specific quota will be searched
for.
:param quota_class: The quota class corresponding to the
project, or for which the quota is to be
looked up. If not provided, it is taken
from the context. If it is given as None,
no quota class-specific quota will be
searched for. Note that the quota class
defaults to the value in the context,
which may not correspond to the project if
project_id is not the same as the one in
the context.
"""
# Get the project ID
project_id = kwargs.get('project_id', context.project_id)
# Ditto for the quota class
quota_class = kwargs.get('quota_class', context.quota_class)
# Look up the quota for the project
if project_id:
try:
return driver.get_by_project(context, project_id, self.name)
except exception.ProjectQuotaNotFound:
pass
# Try for the quota class
if quota_class:
try:
return driver.get_by_class(context, quota_class, self.name)
except exception.QuotaClassNotFound:
pass
# OK, return the default
return self.default
@property
def default(self):
"""Return the default value of the quota."""
return CONF[self.flag] if self.flag else -1
class ReservableResource(BaseResource):
"""Describe a reservable resource."""
def __init__(self, name, sync, flag=None):
"""Initializes a ReservableResource.
Reservable resources are those resources which directly
correspond to objects in the database, i.e., shares, gigabytes,
etc. A ReservableResource must be constructed with a usage
synchronization function, which will be called to determine the
current counts of one or more resources.
The usage synchronization function will be passed three
arguments: an admin context, the project ID, and an opaque
session object, which should in turn be passed to the
underlying database function. Synchronization functions
should return a dictionary mapping resource names to the
current in_use count for those resources; more than one
resource and resource count may be returned. Note that
synchronization functions may be associated with more than one
ReservableResource.
:param name: The name of the resource, i.e., "shares".
:param sync: A callable which returns a dictionary to
resynchronize the in_use count for one or more
resources, as described above.
:param flag: The name of the flag or configuration option
which specifies the default value of the quota
for this resource.
"""
super(ReservableResource, self).__init__(name, flag=flag)
self.sync = sync
class AbsoluteResource(BaseResource):
"""Describe a non-reservable resource."""
pass
class CountableResource(AbsoluteResource):
"""Describe a countable resource.
Describe a resource where the counts aren't based solely on the
project ID.
"""
def __init__(self, name, count, flag=None):
"""Initializes a CountableResource.
Countable resources are those resources which directly
correspond to objects in the database, i.e., shares, gigabytes,
etc., but for which a count by project ID is inappropriate. A
CountableResource must be constructed with a counting
function, which will be called to determine the current counts
of the resource.
The counting function will be passed the context, along with
the extra positional and keyword arguments that are passed to
Quota.count(). It should return an integer specifying the
count.
Note that this counting is not performed in a transaction-safe
manner. This resource class is a temporary measure to provide
required functionality, until a better approach to solving
this problem can be evolved.
:param name: The name of the resource, i.e., "shares".
:param count: A callable which returns the count of the
resource. The arguments passed are as described
above.
:param flag: The name of the flag or configuration option
which specifies the default value of the quota
for this resource.
"""
super(CountableResource, self).__init__(name, flag=flag)
self.count = count
class QuotaEngine(object):
"""Represent the set of recognized quotas."""
def __init__(self, quota_driver_class=None):
"""Initialize a Quota object."""
self._resources = {}
self._driver_cls = quota_driver_class
self.__driver = None
@property
def _driver(self):
if self.__driver:
return self.__driver
if not self._driver_cls:
self._driver_cls = CONF.quota_driver
if isinstance(self._driver_cls, six.string_types):
self._driver_cls = importutils.import_object(self._driver_cls)
self.__driver = self._driver_cls
return self.__driver
def __contains__(self, resource):
return resource in self._resources
def register_resource(self, resource):
"""Register a resource."""
self._resources[resource.name] = resource
def register_resources(self, resources):
"""Register a list of resources."""
for resource in resources:
self.register_resource(resource)
def get_by_project_and_user(self, context, project_id, user_id, resource):
"""Get a specific quota by project and user."""
return self._driver.get_by_project_and_user(context, project_id,
user_id, resource)
def get_by_project(self, context, project_id, resource):
"""Get a specific quota by project."""
return self._driver.get_by_project(context, project_id, resource)
def get_by_class(self, context, quota_class, resource):
"""Get a specific quota by quota class."""
return self._driver.get_by_class(context, quota_class, resource)
def get_defaults(self, context):
"""Retrieve the default quotas.
:param context: The request context, for access checks.
"""
return self._driver.get_defaults(context, self._resources)
def get_class_quotas(self, context, quota_class, defaults=True):
"""Retrieve the quotas for the given quota class.
:param context: The request context, for access checks.
:param quota_class: The name of the quota class to return
quotas for.
:param defaults: If True, the default value will be reported
if there is no specific value for the
resource.
"""
return self._driver.get_class_quotas(context, self._resources,
quota_class, defaults=defaults)
def get_user_quotas(self, context, project_id, user_id, quota_class=None,
defaults=True, usages=True):
"""Retrieve the quotas for the given user and project.
:param context: The request context, for access checks.
:param project_id: The ID of the project to return quotas for.
:param user_id: The ID of the user to return quotas for.
:param quota_class: If project_id != context.project_id, the
quota class cannot be determined. This
parameter allows it to be specified.
:param defaults: If True, the quota class value (or the
default value, if there is no value from the
quota class) will be reported if there is no
specific value for the resource.
:param usages: If True, the current in_use and reserved counts
will also be returned.
"""
return self._driver.get_user_quotas(context, self._resources,
project_id, user_id,
quota_class=quota_class,
defaults=defaults,
usages=usages)
def get_project_quotas(self, context, project_id, quota_class=None,
defaults=True, usages=True, remains=False):
"""Retrieve the quotas for the given project.
:param context: The request context, for access checks.
:param project_id: The ID of the project to return quotas for.
:param quota_class: If project_id != context.project_id, the
quota class cannot be determined. This
parameter allows it to be specified.
:param defaults: If True, the quota class value (or the
default value, if there is no value from the
quota class) will be reported if there is no
specific value for the resource.
:param usages: If True, the current in_use and reserved counts
will also be returned.
:param remains: If True, the current remains of the project will
will be returned.
"""
return self._driver.get_project_quotas(context, self._resources,
project_id,
quota_class=quota_class,
defaults=defaults,
usages=usages,
remains=remains)
def get_settable_quotas(self, context, project_id, user_id=None):
"""Get settable quotas.
Given a list of resources, retrieve the range of settable quotas for
the given user or project.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param project_id: The ID of the project to return quotas for.
:param user_id: The ID of the user to return quotas for.
"""
return self._driver.get_settable_quotas(context, self._resources,
project_id,
user_id=user_id)
def count(self, context, resource, *args, **kwargs):
"""Count a resource.
For countable resources, invokes the count() function and
returns its result. Arguments following the context and
resource are passed directly to the count function declared by
the resource.
:param context: The request context, for access checks.
:param resource: The name of the resource, as a string.
"""
# Get the resource
res = self._resources.get(resource)
if not res or not hasattr(res, 'count'):
raise exception.QuotaResourceUnknown(unknown=[resource])
return res.count(context, *args, **kwargs)
def limit_check(self, context, project_id=None, user_id=None, **values):
"""Check simple quota limits.
For limits--those quotas for which there is no usage
synchronization function--this method checks that a set of
proposed values are permitted by the limit restriction. The
values to check are given as keyword arguments, where the key
identifies the specific quota limit to check, and the value is
the proposed value.
This method will raise a QuotaResourceUnknown exception if a
given resource is unknown or if it is not a simple limit
resource.
If any of the proposed values is over the defined quota, an
OverQuota exception will be raised with the sorted list of the
resources which are too high. Otherwise, the method returns
nothing.
:param context: The request context, for access checks.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
:param user_id: Specify the user_id if current context
is admin and admin wants to impact on
common user.
"""
return self._driver.limit_check(context, self._resources, values,
project_id=project_id, user_id=user_id)
def reserve(self, context, expire=None, project_id=None, user_id=None,
**deltas):
"""Check quotas and reserve resources.
For counting quotas--those quotas for which there is a usage
synchronization function--this method checks quotas against
current usage and the desired deltas. The deltas are given as
keyword arguments, and current usage and other reservations
are factored into the quota check.
This method will raise a QuotaResourceUnknown exception if a
given resource is unknown or if it does not have a usage
synchronization function.
If any of the proposed values is over the defined quota, an
OverQuota exception will be raised with the sorted list of the
resources which are too high. Otherwise, the method returns a
list of reservation UUIDs which were created.
:param context: The request context, for access checks.
:param expire: An optional parameter specifying an expiration
time for the reservations. If it is a simple
number, it is interpreted as a number of
seconds and added to the current time; if it is
a datetime.timedelta object, it will also be
added to the current time. A datetime.datetime
object will be interpreted as the absolute
expiration time. If None is specified, the
default expiration time set by
--default-reservation-expire will be used (this
value will be treated as a number of seconds).
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
"""
reservations = self._driver.reserve(context, self._resources, deltas,
expire=expire,
project_id=project_id,
user_id=user_id)
LOG.debug("Created reservations %s", reservations)
return reservations
def commit(self, context, reservations, project_id=None, user_id=None):
"""Commit reservations.
:param context: The request context, for access checks.
:param reservations: A list of the reservation UUIDs, as
returned by the reserve() method.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
"""
try:
self._driver.commit(context, reservations, project_id=project_id,
user_id=user_id)
except Exception:
# NOTE(Vek): Ignoring exceptions here is safe, because the
# usage resynchronization and the reservation expiration
# mechanisms will resolve the issue. The exception is
# logged, however, because this is less than optimal.
LOG.exception(_LE("Failed to commit reservations %s"),
reservations)
return
LOG.debug("Committed reservations %s", reservations)
def rollback(self, context, reservations, project_id=None, user_id=None):
"""Roll back reservations.
:param context: The request context, for access checks.
:param reservations: A list of the reservation UUIDs, as
returned by the reserve() method.
:param project_id: Specify the project_id if current context
is admin and admin wants to impact on
common user's tenant.
"""
try:
self._driver.rollback(context, reservations, project_id=project_id,
user_id=user_id)
except Exception:
# NOTE(Vek): Ignoring exceptions here is safe, because the
# usage resynchronization and the reservation expiration
# mechanisms will resolve the issue. The exception is
# logged, however, because this is less than optimal.
LOG.exception(_LE("Failed to roll back reservations %s"),
reservations)
return
LOG.debug("Rolled back reservations %s", reservations)
def usage_reset(self, context, resources):
"""Reset usage records.
Reset the usage records for a particular user on a list of
resources. This will force that user's usage records to be
refreshed the next time a reservation is made.
Note: this does not affect the currently outstanding
reservations the user has; those reservations must be
committed or rolled back (or expired).
:param context: The request context, for access checks.
:param resources: A list of the resource names for which the
usage must be reset.
"""
self._driver.usage_reset(context, resources)
def destroy_all_by_project_and_user(self, context, project_id, user_id):
"""Destroy metadata associated with a project and user.
Destroy all quotas, usages, and reservations associated with a
project and user.
:param context: The request context, for access checks.
:param project_id: The ID of the project being deleted.
:param user_id: The ID of the user being deleted.
"""
self._driver.destroy_all_by_project_and_user(context,
project_id, user_id)
def destroy_all_by_project(self, context, project_id):
"""Destroy metadata associated with a project.
Destroy all quotas, usages, and reservations associated with a
project.
:param context: The request context, for access checks.
:param project_id: The ID of the project being deleted.
"""
self._driver.destroy_all_by_project(context, project_id)
def expire(self, context):
"""Expire reservations.
Explores all currently existing reservations and rolls back
any that have expired.
:param context: The request context, for access checks.
"""
self._driver.expire(context)
@property
def resources(self):
return sorted(self._resources.keys())
QUOTAS = QuotaEngine()
resources = [
ReservableResource('shares', '_sync_shares', 'quota_shares'),
ReservableResource('snapshots', '_sync_snapshots', 'quota_snapshots'),
ReservableResource('gigabytes', '_sync_gigabytes', 'quota_gigabytes'),
ReservableResource('snapshot_gigabytes', '_sync_snapshot_gigabytes',
'quota_snapshot_gigabytes'),
ReservableResource('share_networks', '_sync_share_networks',
'quota_share_networks'),
]
QUOTAS.register_resources(resources)